DOCUMENT #:
GSC15-PLEN-35
FOR:
Presentation
SOURCE:
ARIB
AGENDA ITEM:
6.6
CONTACT(S):
t-yamamoto@bu.jp.nec.com
Activities on ITS cooperative systems
in Japan
Takeshi YAMAMOTO
Global Standards Collaboration (GSC)
GSC-15
Highlight of Current Activities
 Feasibility tests
• Evaluation on propagation characteristics and packet delivery
performance on various public road, V2V and V2I integration
functionality and Inter-system interference.
 Standardization
• Feasibility test guideline; “ITS Forum RC-006” has been developed
in ITS Info-Communications Forum.
• ARIB standard development has started, based on RC-006 and
feedback from feasibility tests.
 International Harmonization
• In ITU-R, Japan proposed to develop a technical report on
“advanced ITS radiocommunications ”.
• In AWF, TG-ITS has been established, based on proposal by
Japan.
2
Strategic Direction
 Contribute to reduction of the number of traffic fatalities
and serious injuries by deploying Cooperative Safe Driving
Support Systems using Vehicle-to-Vehicle(V2V) and
Vehicle-to-Infrastructure(V2I) communications
 Effective utilization of radio frequency for ITS in 700MHz
band, available from July 2012
 Standardization will be based on “Feasibility test guideline”
and feedback from the feasibility tests.
 Observation: Further feasibility tests will be effective for
acceleration of system development and the
standardization.
3
Challenges
 Technical challenges
• Integration of V2V and V2I communications in a 10MHz
channel
• Inter-system interference
• Shadowing and Hidden node problem
• Accuracy of position information
• Information security
 Operational challenges
• Establishment of a framework of operation and
management
• Management of the reliability and the quality of services
4
Next Steps/Actions
 Further feasibility tests
• Security, Inter-operability and other items are supposed
to be evaluated.
 Standardization in ARIB
• The new ARIB standard will be based on “ITS Forum
RC-006” with feedback from feasibility tests.
• ARIB STD draft0.1 (2010-06,by ITS Infocommunications Forum)
• ARIB STD-Txxx ver1.0 (2011-06)
 International harmonization
• Activities in ITU-R SG5 WP5A, AWF TG-ITS and GSC
ITS TF will be done for international harmonization.
5
Supplementary Slides
6
Effects of Safe Driving Support Systems
80% of traffic accidents occur at intersections or locations with poor
visibility. 70% of traffic accidents are caused by failure to recognize a
hazard in time.
[ Types of traffic accidents]
[ Types of human error]
Collisions with
pedestrians
Other
Rear-end
collisions
9%
26%
Collisions with
cross traffic at
intersections
32%
14%
Right-turn or left-turn
collisions
Errors in operation
Errors in
judgment
70%
Failure to recognize a
hazard in time
Safe driving support systems utilize radio systems to effectively
supply information on hazards that may not be visible to the driver.
Spectrum Use After “Digital Dividend”
Current Spectrum Allocation
90～108MHz
（1～3ch）
470～770MHz
（13～62ch）
170～222MHz
（4～12ch）
Analog TV
Analog and Digital TV
Analog TV
After digitization
Future Spectrum Allocation
Digital TV（13～52ch）
108 170
90
222
710
770
New Spectrum Use
Spectrum Allocation Plan (December, 2007）
90～108MHz
90
108 170
10MHz
170～222MHz
205
222
715
725
710～770MHz
730
770
Gardband (-5MHz)
Self-owned
communications
(to preserve security and safety)
Broadcasting
(multi-media mobile
broadcasting etc.)
ITS
Available from July, 2012
Telecommunications
(cellular phones etc.)
8
Feasibility test guideline for Safe Driving
Support Systems in 700MHz Band
“ITS FORUM RC-006”







Radio frequency: 720MHz (Single channel)
Type of transmission: Broadcast
MAC: CSMA/CA
Modulation: BPSK OFDM/QPSK OFDM/16QAM OFDM
Number of subcarriers: 52
Maximum transmission power: 10mW/MHz
Occupied bandwidth: Less than 9MHz
9
Draft System Architecture
 The red dashed line indicates the scope of the new ARIB
standard for advanced ITS radiocommunications in Japan.
L7：Application Layer
System
IVRLME
_SAP
IVRI_SAP
IVC-RVC
Management
Entity (IVRLME)
LLC_SAP
MLMEX
_SAP
MLME
_SAP
MAC_SAP
MLME
Extension
MAC Sub-layer
Management
Entity (MLME)
PHY Sub-layer
Management
Entity (PLME)
IP
extension
（TCP/IP
UDP/IP）
LLC_SAP
LLC Sub Layer
Management
PLME
_SAP
IVC-RVC Integrated
Access Control Information
APP4
SEC
_SAP
APP3
SEC
_SAP
APP2
SEC
_SAP
SME
_SAP
SME
_SAP
APP1
MAC Sub Layer
IVC-RVC Integrated
Access Control
PHY_SAP
PHY
Security
Management
ITS Radiocommunication Standardization
in Japan
ISO TC204
ITU-R
APT: Asia-Pacific
Telecommunity
APT
ITS National
Committee
(JSAE)
Information and
Telecommunications
Technology Council
MIC: Ministry of
Internal Affairs and
Communications
(MIC)
ARIB
ITS Standards
(DSRC, V2V, V2I etc.)
(Association of
Radio Industries
and Businesses)
Technical
Committee
ITS Info-communications Forum
ITS Standards
(DSRC, V2V, V2I etc.)